springmvc 注入总是空指针异常

Question

各位大牛，小弟又来请教问题了
tomcat7.0+ spring3.1.1 + hibernate3.6.0
程序跑起来了，但是输入url后，抛空指针异常，查了很多资料，都没找到解决办法，请教大神

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
root cause

java.lang.NullPointerException
cc.fanbang.api.manager.DBManager.addUser(DBManager.java:142)
cc.fanbang.api.controller.TestController.handleDBManagerTestRequest(TestController.java:43)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

数据库配置成功，运行之后所有表建立起来
这是applicationContext.xml
destroy-method="close" >

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="mappingDirectoryLocations">
        <list>
            <value>WEB-INF/mappings</value> 
        </list>
    </property>
    <property name="hibernateProperties" >
        <value>
            hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
            hibernate.hbm2ddl.auto=update
            hibernate.show_sql=true
            hibernate.format_sql=true
            hibernate.cache.use_second_level_cache=true
            hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
        </value>
    </property>
</bean>

<bean id="userDaoHibernate" class="cc.fanbang.api.dao.impl.UserDaoHibernate">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

这是spring-servlet.xml

<bean id="dbManager" class="cc.fanbang.api.manager.DBManager" >  
    <property name="userDaoHibernate" ref="userDaoHibernate" />

<!--




-->

<bean id="viewResolver"
    class="org.springframework.web.servlet.view.UrlBasedViewResolver">
    <property name="viewClass"
        value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
</bean>

这是web.xml

contextConfigLocation
/WEB-INF/applicationContext.xml

org.springframework.web.context.ContextLoaderListener

index.html
index.htm
index.jsp
default.html
default.htm
default.jsp

<servlet>
    <servlet-name>spring</servlet-name>
    <servlet-class>
        org.springframework.web.servlet.DispatcherServlet
    </servlet-class>

    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>spring</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

Answer 1

忘了说明，userDaoHibernate注入失败，总是空指针 userDaoHibernate有setter方法吗？